blistovmhz
NAXJA Forum User
- Location
- Vancouver, BC
98 xj, chrysler 8.25 rear, 4.10 gears, posi (clutch type).
Posted lots of threads about this before, but something's finally changed!
So I've got this clunk. Yea, I know it's "they chrysler clunk" and I know "it's a Jeep thing" and I know "you should get a prius" but I never accept any of these answers so while I thank you for your time, I'm not interested in either response. I want a fix.
As always, clunk when hitting or releasing the gas. Yes, it's definitely the diff, I've checked and everything else is tight.
So today on the way back from a few hundred km trip, I noticed the diff was getting awfully hot. It normally doesn't seem to get above ambient temp but today I couldn't hold my hand on it. Got home and as I turned the corner to park, it made some horrible deep rubbing/grinding noise. Not metal on metal, but more like clutch binding (well, actually the clutch slipping) due to insufficient (or too much?) friction modifier. But, I haven't changed the oil today so I'm guessing either water intrusion or heat has changed the viscosity of the oil. The oil seemed sorta green.
Tests and results:
* Trans in reverse, t-case in 4L, lift one wheel off the ground - The wheel can spin about 1/4" before the ring gear moves. Once the ring gear moves, the pinion moves deadly. The slop is somewhere from the axle splines to the carrier. May be the splines themselves on the axle or the carrier or both are worn?
* Trans in neutral, t-case in neutral, lift one wheel off the ground - The wheel behaves exactly the same, as it should because the posi is grabbing, and trying to transfer power to the wheel on the ground. If I really reef on it though, I can spin the wheel by hand and there's my new grindy sound. So ... I'm guessing I shouldn't be able to overpower the posi by hand right? Worn plates or friction incorrect?
* All neutral, both tires in the air - Spin one wheel, and the other spins the same direction as it should. If I quickly stop one wheel, the other keeps moving another 1/2-3/4" before the clunk.
* Drop it all back down and start hitting the carrier. Ho-shit the right side of the carrier can be pried up about 1mm. I'm guessing this is my carrier bearing failing yes? The left side (ring side) doesn't seem to lift or have any up/down play. I can however, pry the carrier to the left about 1mm. Does not move to the right at all.
So a few questions.
1. Where the hell is the posi clutchpack? It doesn't seem like there's any room for it anywhere. Is it that small bit to the left of the ring gear that's about 1/2" wide?
2. What's everyone think? Time for a whole new carrier, and posi? The bearings and clutch discs are cheap, but if I've got play between the axle and carrier splines, are the spines on one the axle more likely to wear than the carrier, or are they going to wear pretty much as a set? Is there something else between the axles and the carrier that might cause this play? Spiders looked good and didn't seem to have any play. I guess I don't really know what the axle splines connect to first. Someone chime in?
Posted lots of threads about this before, but something's finally changed!
So I've got this clunk. Yea, I know it's "they chrysler clunk" and I know "it's a Jeep thing" and I know "you should get a prius" but I never accept any of these answers so while I thank you for your time, I'm not interested in either response. I want a fix.
As always, clunk when hitting or releasing the gas. Yes, it's definitely the diff, I've checked and everything else is tight.
So today on the way back from a few hundred km trip, I noticed the diff was getting awfully hot. It normally doesn't seem to get above ambient temp but today I couldn't hold my hand on it. Got home and as I turned the corner to park, it made some horrible deep rubbing/grinding noise. Not metal on metal, but more like clutch binding (well, actually the clutch slipping) due to insufficient (or too much?) friction modifier. But, I haven't changed the oil today so I'm guessing either water intrusion or heat has changed the viscosity of the oil. The oil seemed sorta green.
Tests and results:
* Trans in reverse, t-case in 4L, lift one wheel off the ground - The wheel can spin about 1/4" before the ring gear moves. Once the ring gear moves, the pinion moves deadly. The slop is somewhere from the axle splines to the carrier. May be the splines themselves on the axle or the carrier or both are worn?
* Trans in neutral, t-case in neutral, lift one wheel off the ground - The wheel behaves exactly the same, as it should because the posi is grabbing, and trying to transfer power to the wheel on the ground. If I really reef on it though, I can spin the wheel by hand and there's my new grindy sound. So ... I'm guessing I shouldn't be able to overpower the posi by hand right? Worn plates or friction incorrect?
* All neutral, both tires in the air - Spin one wheel, and the other spins the same direction as it should. If I quickly stop one wheel, the other keeps moving another 1/2-3/4" before the clunk.
* Drop it all back down and start hitting the carrier. Ho-shit the right side of the carrier can be pried up about 1mm. I'm guessing this is my carrier bearing failing yes? The left side (ring side) doesn't seem to lift or have any up/down play. I can however, pry the carrier to the left about 1mm. Does not move to the right at all.
So a few questions.
1. Where the hell is the posi clutchpack? It doesn't seem like there's any room for it anywhere. Is it that small bit to the left of the ring gear that's about 1/2" wide?
2. What's everyone think? Time for a whole new carrier, and posi? The bearings and clutch discs are cheap, but if I've got play between the axle and carrier splines, are the spines on one the axle more likely to wear than the carrier, or are they going to wear pretty much as a set? Is there something else between the axles and the carrier that might cause this play? Spiders looked good and didn't seem to have any play. I guess I don't really know what the axle splines connect to first. Someone chime in?